To simulate reverberant noise, the noise sources are placed within the acoustic environment by the ISM.
This gives a number of RIRs for the noise sources which each may be convolved with noisy sounds, thus placing the noisy sounds within the room.
Recorded noise such as the noise files from the Aurora 2 database [1]} cannot be placed in this way, because the recordings contain different Room Impulse Responses (RIRs) compared to the noise sources in the simulated room, as discussed in [2]}.
However, clean speech utterances can be placed at each noise source location to simulate competing speakers.
Utterances from the NOIZEUS database [3]} [4]} are placed in this way at six different locations in the room.
The six locations are placed 3 away from the center point of the microphone array in a circle with a height fixed at 1.7.
